[release/6.0] Enforce scatter/gather file I/O Windows API requirements et. al.#58423

Merged

Anipik merged 13 commits intorelease/6.0from backport/pr-57424-to-release/6.0

Oct 19, 2021

+195-114

Commits on Aug 31, 2021

Move checking and pinning Windows vectored I/O buffers to a dedicated method.

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Refactor the scatter/gather APIs to use the common checking method.

teo-tsirpanis
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Shorten the name of the buffer-checking method.

teo-tsirpanis
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Directly get the pinned array's address instead of calling GCHandle.AddrOfPinnedObject.

teo-tsirpanis
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Refactor the error handling logic in TryPrepareScatterGatherBuffers.

teo-tsirpanis
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Allocate the segment array from native memory and at TryPrepareScatterGatherBuffers.

teo-tsirpanis
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Cache the page size on a static readonly field and add a couple of TODOs.

teo-tsirpanis
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Make the memory handlers readonly structs.

teo-tsirpanis
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Add a test.

teo-tsirpanis
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Reorder some methods with PR feedback taken into consideration.

teo-tsirpanis
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Stop special-casing scatter/gather operations with zero or one buffer.

teo-tsirpanis
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Factor the cleaning-up of the segment buffers into a separate method.

teo-tsirpanis
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Commits on Oct 18, 2021

Follow up on Scatter/Gather API changes (#58447 )

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adamsitnik
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